Watch-crown



H. LBFORT. Watch-Crown.

No. 226,329. Patented April 6,1880.

INVENTUR s/of M Y DD WITNES SES ATTORNEYS.

NPETERS, PNOTO-UTNOGRAPHER. WASHINGTON D c UNITED I STATES PATENT OFFICEO HENRY LEFOR'I, OF NEVARK, NEW JERSEY.

WATCH-CROWN.

SPECIFICATION forming part of Letters Patent No. 226,329, dated April 6, 1880.

Application filed January 19, 1880.

To all 'whom it may concern Be it known that I, HENRY Lnronr, of Newark, Essex county, New Jersey, have invented a new and Improved latch-Grown, of which the following is a specication.

The object of my invention is to furnish a new and improved watch-crown which can be easily held and adjusted in the pendant and is simple in construction.

The invention consists in a sj'ning-bushing loosely mounted on a flanged sleeve adjustable on the pin of a watch-crown, whereby the crown is held in the pendant by the pressure of this spring-bushing against the sides of the pendant.

In the accomin'ianying drawings, Figure l is a cross-sectional elevation of a crown and pendantprovided with my improvement. Figs. 2 and 3 are elevations ofthe pin, showing the spring-bushing in different positions. Fig. 4 is a cross-sectional eleva-tion of a crown and pendant provided with a modilication of my improvement. Fig. 5 is an elevation of a pin provided with the modified bushing, and Fig. 6 is a top view of the same.

Similar letters of reference indicate corresponding parts.

A watch-crown, A, is attached to a threaded push-pin, B, terminating in a squared or recessed key, C, and provided with a shoulder, D, like the ordinary stem-winding push-pin. A sleeve, E, provided with an annular flange, F, at its lower end, is screwed onto the threaded pin B, and can be adjusted higher or lower on the same by simply rotating it. Upon the anged sleeve Ea spring-bushing, G, is loosely mounted, so as to rest on the liange F, but is free to rotate on the vertical axis.

The sides of the spring-bushing G- may be curved outward, as shown in Figs. 2 and 3, or may be straight, and the bushing may be provided with a large recess, as shown at Figs. 2 and 3, may have one or two slots, as shown in Figs. 5 and 6, or may be cylindrical without any notches or recesses, the metal havin g sufficient spring without them.

The pendant H may have an annular notch or recess, J, on the inner side, as shown in Fig. l, or may be straight, as shown at Fig. 4.

The pin B (shown in Fig. l) is for a hunt ing-case stemwinding watch, the lower edge of the shoulder D acting upon the lockingspring, whereas the pin I (shown in Figfl) belongs to an open-face stem-winding watch, which does not require a locking-spring and need not be adjusted. For that reason the iianged sleeve E is dispensed with and the swing-bushing Gr is loosely mounted on the pin I and rests on the shoulder K.

The springbushing may be made ot any kind of metal, and any kind of key may he attached to the crown.

The operation is as follows: The push-pin being inserted in the pendant H,l the springbushing G spreads and catches under shoulders formed by the annular groove in the pendant, or presses against the sides of the pendant, in case the same is not provided with a groove, with suflicient force to hold the pin in the pendant and prevent its Jfalling out or being drawn out easily. The iianged sleeve Eis adjusted according to the required depression ot' the locking-spring. It' the crown and pin are drawn outward with considerable force, the spring-bushing will be forced against the pin by the sides of the pendant, and the cross-section of the pin and spring-bushing will he reduced suiiiciently to permit of drawing the pin out. As soon as it is inserted again the spring-bushing spreads and keeps it locked and prevents it from falling out. ln this way the pin and crown are held securely, can be easily removed and adjusted to suit any arrangement of the works, and are made much simpler than similar devices used heretofore, which required a nicely-adjusted recesscd collar held by a screw passing through the pendant. This screw was a continual source oi' trouble and required to be adjusted with the greatest care.

Itl the pendant is not perfectly straight, the key will always be in the center if my improved device is used, 'for the springbushing holds the' crown tight in the pendant, and it' the crown tits tight the key will be in the center. f

Having thus described my invention, I claim as new and desire to secure by Letters Patcnt- 1. The combination, with the push-pin of a IOO 4. The combination, wit-h the pin B, of the crown A and the spring-bushing Gr,1oosel y mounted on pin B, substantially as herein shown und described, und for the purpose set forth.

HENRY LEFORT.

Witnesses:

OSCAR T. GUNZ, C. SEDGWIOK. 

